Effect of home-based transcranial direct current stimulation (tDCS) on cognitive functioning in bipolar depression

Area of Science:

• Neuroscience
• Psychiatry
• Medical Devices

Background:

• Bipolar depression frequently involves cognitive impairments.
• Transcranial direct current stimulation (tDCS) is a developing non-invasive treatment for bipolar depression.
• A home-based tDCS protocol with real-time supervision was developed due to tDCS's portability and safety.

Purpose of the Study:

• To evaluate the cognitive effects of home-based tDCS in individuals with bipolar disorder.
• To assess the efficacy of a 6-week, 21-session tDCS protocol (2 mA, bilateral frontal montage) on cognitive function.

Main Methods:

• 44 participants with moderate to severe bipolar depression underwent home-based tDCS.
• Cognitive assessments, including the Rey Auditory Verbal Learning Test (RAVLT) and Symbol Digit Modalities Test (SDMT), were performed at baseline and post-treatment.
• The protocol involved 30-minute sessions using a bilateral frontal montage (F3 anode, F4 cathode).

Main Results:

• A statistically significant improvement in RAVLT short-term verbal memory scores was observed post-treatment (p = 0.002).
• Trends towards improvement were noted in RAVLT verbal learning, RAVLT post-interference recall, and SDMT, although these did not reach statistical significance.
• High completion rates for RAVLT (93.18%) and SDMT (59.09%) were reported.

Conclusions:

• Home-based tDCS demonstrated a positive impact on cognitive function in individuals with bipolar depression.
• The findings suggest tDCS is a potentially effective intervention for cognitive deficits in bipolar depression.
• This study supports the feasibility and efficacy of supervised, home-based tDCS for managing cognitive symptoms in bipolar disorder.